Triple-action jack.



m1. 660,766. Patented Oct. 30, I900.

E. E. L. BUYER. TRIPLE ACTION JACK.

(Application filed July 18, 1900.)

( No Model.)

Hndnhm WITNESSES:

UNTTED STATES PATENT OFFICE.

EDITH E. L. BOYER, OF DAYTON, OHIO;

TRIPLE-ACTION JACK.

mementos forming part of Letters Patent No. 660,766, dated October 30,1906.

Application filed July 13, 1900. Serial No- 23,466. (No model.)

To all w/tmn it may concern:

Be it known that I, EDITH E. L. BOYER, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented a certain new and use fulImprovement in Triple-Action Jacks;and I do hereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same, reference being badto the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

My invention relates to a lifting-jack, but appertains more especiallyto that class known as triple-action jacks.

The objects of my invention are to provide simple and reliable means forlowering step by step and for making a quick drop in a jack strong andeasy of construction and inexpensive in cost of manufacture; also, theprovidinga jack with the mechanism entirely inclosed and protected bythe casing.

Referring to the accompanying drawings, illustrating my invention, andin which like numerals and letters of reference indicate correspondingparts throughout the several views, Figure 1 is a side view of myimproved jack with the casing in vertical section and showing the insidewith the mechanism partially in section and the position the partsassume during the operation of lowering, with the retaining-pawl heldout of engagement with the ratchet-barand the lifting-pawl engaging theratchet-bar when about to lower the load. Fig. 2 is a side view of myimproved jack with the casing in vertical section and showing the insidewith the mechanism partially in section and the position the partsassume during the operation of lowering, with the retaining-pawlengaging the ratchetbar and supporting the load and the liftingpawl heldout of engagement with the ratchetbar for the purpose of rising withoutlifting the ratchet-bar. Fig. 3 is an enlarged detail View inperspective of the lowering device. Fig. 4 is a sectional View of theupper ortion of the casing broken away, so as to show the retaining-pawland its actuating-spring with its plunger and casing in section, thesein position to throw said retaining-pawl out of engagement with theratchet-bar for a quick drop; and Fig. 5 is an enlarged detail view inperspective of the small handle or thumbpiece which moves the actuating-spring, plunger, and the easing into position to throw theretaining-pawl in or out of engagement with the lifting-bar.

Referring in detail to the various parts of my invention as shown in theaccompanying drawings by means of the aforesaid numerals and letters ofreference, 1 indicates the easing, which entirely incloses and protectsthe mechanism, said casing being suitably and conveniently provided onthe inside of both sides of the front with a rib 2. The ratchet orlifting bar 3 is provided at its top with a cap or top 4 for supportingthe load while being raised or lowered. 5 is the foot, located at thebottom of said lifting-bar for the purpose of raising or lowering a loadwhich is too low or near the ground to be supported by cap 4, said footbeing provided on each of its sides with a groove 6, adapted to restover rib 2 of the casing, thus assisting in holding said ratchet orlifting bar in position and guiding it as it is moved up or down duringthe operation of the jack.

7 is the lever-socket, in which is inserted the handle or lever foroperating the jack, said socket being formed with a bifurcated end 8,one side of which is formed with fingers 9 and 10, as shown in Figs. 1and 2, (and which will be more specifically referred to hereinafter,)the other side of said bifurcated end being the exact size incircumference of the boss, as shown at 11. Located between the two sidesof the bifurcated end is eccentric 12, as shown in dotted lines, whichis provided at each side with a projecting or fulcrum pin 13. The endsof said pin pass through the bifurcated end of and support saidlever-socket by being revolubly journaled in bearings in the casing, andthus form the fulcrum upon which said lever socket turns.

Eccentric 12 is securely connected to the bifurcated end of thelever-socket by a small pin 14. Lifting-pawl 15 is mounted on saideccentric and provided with a spring 16, suitably connected at its topat 17 to said liftingpawl and at its bottom, as at 18, for the purposeof exerting a constant and suflicient tenend 23 of plunger 24, which isincased in cas ing 25 and actuated by spring 26, presses against thelower end27 of said retainingpawl, thus turning or pressing saidretaining-pawl forward, so that its teeth 28 will engage teeth 20 ofratchet-bar 3, said spring yielding to permit their disengagement.

When the lowering device or bar A is brought into action for the purposeof lowering the ratchet-bar step by step or tooth by tooth by placingthumb-piece or handle 5 into the straight portion of slot and guide 38in one side of the casing (shown by dotted lines in Figs. 1 and 2) andwhen the handle or le- 'ver and socket is pressed to a horizontalposition, (shown in Fig. 1,) eccentric l2 raises lifting-pawl 15 and itsteeth 19 (by means of the tension of spring 16) will be brought intoengagement with and support said ratchet or lifting bar 3, and finger 9of socket 7 will strike lug ct of the lowering device or bar A (guidedby handle-piece b and shoulder 0) until straight shoulder e of saidlowering device or bar coming in contact with lug 29 of retaining-pawl21 will cause it to rotate on shaft 22 and its teeth28 will be forcedout of engagement with teeth 20 of ratchet-bar 3 and all the partsassume the positions shown in Fig. 1, where the retaining-pawl is heldout of engagement with lifting-bar and the load is resting onlifting-pawl ready to descend with said lifting-pawl as the lever israised. Then the lever or handle is moved to an upward position, socket7 will turn on its fulcrum-pin 13, and lifting-pawl 15, carried byeccentric 12, will be lowered the distance of one tooth, carryinglifting-bar 3 with it. Finger on upper end of lever-socket will sweep orpass through a recessed or cut-out portion (1 in lowering-bar A, (seeFig. 3,) held by pressure of lug 29, forcing its shoulder 0 againstcasing, and strike its lug a, thus throwing it downward and moving itsshoulder 6 out of engagement or contact with lug 29, thus releasing saidretaining-pawl, which, actuated by its spring 26 and plunger 24, willengage the lifting-bar 3 and support the load; but its teeth 28 willengage teeth 20 of said lifting bar 3 one tooth higher up than thoseengaged by said retaining-pawl before it was forced out of engagementwith said teeth by shoulder e of lowering device A, as heretoforedescribed. This by-reasoh of ratchet-bar having been lowered said toothor step with lifting-pawl while retaining-pawl was held out ofengagement with lifting-bar, as heretofore described. Then by continuedupward motion of lever or handle projection 30 on lifting-pawl comes incontact with brace-bar 31, said brace-bar and said projection being soformed that when they come in contact said lifting-pawl will be forcedaway from said lifting-bar and its teeth 19 be thrown out of engagementwith teeth of said lifting-bar. Then lowering device A being free tofall, its shoulder 6 will fall behind teeth 19 of lifting-pawl l5 andall the parts assume position shown in Fig. 2. Now pressing down thelever or handle in continuing the operation of lowering the load step bystep liftingpawl 15 rises until its teeth 19 have risen up past onetooth on ratchet-bar before finger 9 strikes lug a, on lowering-bar,causing shoulder 6 to be lifted above and release said lifting-pawl,thus allowing its teeth 19 to engage said higher tooth on lifting-bar.Lowering device A is still further raised by linger 9 until its shouldere engages lug 29 of retaining-pawl 21, and the parts are again as inFig. 1,'except that the lifting-bar is one tooth 'lower down than beforethe upward-anddownward motion of the lever or handle just described.

To raise the load, lowering device or bar A is moved by simply movingsmall handlepiece I), which projects through the slotted opening andmoves through said slot 38, located in one of the sides of the casing,until said handle-piece rests in the notched or recessed portion 32 andsaid lowering-bar has assumed the position shown in dotted lines in Fig.2, where it is entirely out of the way of and free from contact with lug29, teeth 19, and fingers 9 and 10, allowing the lifting and retainingpawls to engage lifting-bar by reason of the action of spring 16 on saidlifting-pawl and spring 26 and plunger 24 on said retaining-pawl andwork in the ordinary manner of a ratchet. Brace-bar 31 does notinterfere with said working, it being so situated that lifting-pawl 15must be'moved slightly farther down than necessary in the ordinaryworking before the projection strikes said brace-bar 31.

When it is desired to drop the load suddenly or make what is termed aquick drop, lowering device A is moved to the position as just describedand as shown in dotted lines in Fig. 2, where it is entirely out of theway and free from contact with any of the parts, and eccentric is turnedby means of small thumb-piece or handle 33, (shown in Fig. 5,) whichfits over pin 34 of eccentric 35, while the other end is journaled inthe casing, (from the position shown in Figs. 1 and 2 to the positionshown in Fig. 4,) and by means of slot 36, in which it turns, turns thecasing or shell 25 on shaft 37, journaled in casing l of the jack,forcing end 23 of plunger 24 past end 27 of retaining-pawl 21, when itwill press said retaining-pawl outwardly from teeth of lifting-bar. Aslight downward motion of lever will now release retaining-pawl frompressure of the load, when it will assume the position shown in Fig. 4,with its teeth out of engagement with teeth of lifting-bar. Then byupward motion of the lever the lifting-pawl 15 will descend until itsprojection 30, coming in contact with brace-bar 31, will be thrown andheld in an outward position, forcing its teeth 19 out of engagement withthe teeth of 1ifting-bar3, as shown in Fig. 2, thus leaving saidlifting-bar unsupported, when it will make a quick drop.

A very important feature of my invention consists in the simplicity ofconstruction of the lowering device or bar, which is formed in one pieceWithout any multiplicity of parts.

Having now described my tri ple-action jack, What I claim as myinvention is- 1. In a lifting-jack, the combination with a suitablecasing, having a slot or guide and a notch at one side thereof, alifting-bar, a lever provided with fingers, a lifting-pawl and aretaining-pawl, of a lowering device formed with a projection, adaptedto move in said slot or guide and thus hold the lowering device inoperation, or to be placed in said notch and thus hold the loweringdevice out of operation, said lowering device having a shoulder adaptedto engage and disengage the lifting and retaining pawls alternately, anda lug adapted to be engaged by the fingers on the lever only when thelowering device is in position to operate, substantially as described.

2. In a lifting-jack the combination of the lifting-bar; the lifting andretaining pawls adapted to engage or disengage said liftingbar; aprojection on said lifting-pawl; a bracebar adapted to engage saidprojection; a lowering device consisting of a single member so formedand constructed as to alternately disengage said lifting and retainingpawls from said lifting-bar; and means suitably arranged within itscasing or body for operating said jack, all substantially as described.

3. In a jack with its lifting-bar; the combination of the lifting andretaining pawls; the lowering device consisting of a single piece formedwith a lug; a handle or lever provided with a socket; an eccentric withits fulcrumpin upon which said lever-socket turns; fingers formed on theend of said socket and adapted to engage said lug of said loweringdevice, for the purpose of raising and lowering said lowering device;said lowering device adapted to throw and hold said retaining andlifting pawls out of engagement with said lifting-bar; all substantiallyas described.

4. In a lifting-jack, a retaining-pawl adapted to pivotally move onbearings, and having an end suitably formed and adapted for engagementwith the lifting-bar; in combination with a shell or casing, pivotallymounted and provided with a slotted portion, an cecentric turning withinsaid slottedportion, a plunger and its actuating-spring within saidcasing, adapted to engage said retaining-pawl and press or throw it intoor out of engagement with said lifting-bar, substantially as described.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

EDITH E. L. BOYER.

Witnesses:

E. J. FINKE, W. H. H. 1310111.

